Fix vegetation geodata

[dchassin]

This PR fixes issues with vegetation geodata processing.

Current issues

1. Work in progress

Code changes

• Update gridlabd-geodata to gather and join geographic data.
• Update geodata_address to provide conversion between locations (e.g., latitude and longitude) and addresses.
• Update geodata_census to deliver US census data by zip code or census tract.
• Update geodata_distance to compute the shortest distance between consecutive positions.
• Update geodata_elevation to obtain the elevation of locations using eio package and 2D interpolation.
• Update geodata_powerline to compute the line sag between two poles.
• Update geodata_utility to obtains information about utilities and their service territories. The information is collected from Homeland Infrastructure Foundation-Level Data (HIFLD) website.
• Update geodata_vegetation to obtain the vegetation information at locations, such as base, cover, and height, using the CFO package.
• Update gldcore/geodata/docs/Geodata.ipynb to provide a tutorial for using the geodata subcommand in GridLAB-D.

Documentation changes

1. Summary for the calculation of overhead conductor line sag.

• TODO
• [TODO] Summary for the preparation of vegetation data.

Test and Validation Notes

• TODO

1. Enumerate any testing and validation considerations.